EP 0155586 A1 19850925 - Process for the preparation of dinitrotoluene.
Title (en)
Process for the preparation of dinitrotoluene.
Title (de)
Verfahren zur Herstellung von Dinitrotoluol.
Title (fr)
Procédé pour la préparation de dinitrotoluène.
Publication
Application
Priority
DE 3409719 A 19840316
Abstract (en)
[origin: ES8602594A1] In prepn. of dinitroluene (II) by 2-stage reaction of toluene with HNO3 in presence of H2SO4, in which (1) toluene is nitrated to mononitrotoluene by effluent acid from the 2nd stage and (2) mononitrotoluene is nitrated to II by conc. effluent acid from the 1st stage, the effluent acid is conc. in indirectly heated evaporators in a vacuum, and mononitrotoluene is fed to the superheated vapours of the evaporator. - Mononitrotoluene (I) is added as a mixt. contg. I, pref. as part of the organic phase which is sepd. after the mononitrations. In the organic phase of the condensed vapours, the ratio of I:II is 2-10:1 (4-7:1).
[origin: ES8602594A1] In prepn. of dinitroluene (II) by 2-stage reaction of toluene with HNO3 in presence of H2SO4, in which (1) toluene is nitrated to mononitrotoluene by effluent acid from the 2nd stage and (2) mononitrotoluene is nitrated to II by conc. effluent acid from the 1st stage, the effluent acid is conc. in indirectly heated evaporators in a vacuum, and mononitrotoluene is fed to the superheated vapours of the evaporator. - Mononitrotoluene (I) is added as a mixt. contg. I, pref. as part of the organic phase which is sepd. after the mononitrations. In the organic phase of the condensed vapours, the ratio of I:II is 2-10:1 (4-7:1).
Abstract (de)
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Dinitrotoluol durch zweistufige Umsetzung von toluol mit Salpetersäure in Gegenwart von Schwefelsäure, wobei in der ersten Stufe Toluol zu Mononitrotoluol nitriert wird unter Verwendung der Absäure aus der zweiten Stufe, in der das Mononitrotoluol zu Dinitrotoluol nitriert wird unter Verwendung der im Vakuum aufkonzentrierten Säure aus der ersten Stufe.
IPC 1-7
IPC 8 full level
C07C 67/00 (2006.01); C07C 201/00 (2006.01); C07C 201/08 (2006.01); C07C 205/06 (2006.01)
CPC (source: EP KR US)
C07C 201/06 (2013.01 - KR); C07C 201/08 (2013.01 - EP US)
C-Set (source: EP US)
Citation (search report)
- [A] EP 0066202 A1 19821208 - AIR PROD & CHEM [US]
- [A] EP 0022181 A2 19810114 - BAYER AG [DE], et al
Designated contracting state (EPC)
BE DE FR GB IT NL
DOCDB simple family (publication)
EP 0155586 A1 19850925; EP 0155586 B1 19871028; BR 8501167 A 19851112; CA 1238652 A 19880628; DE 3409719 A1 19850919; DE 3560827 D1 19871203; ES 541319 A0 19851201; ES 8602594 A1 19851201; JP H0137389 B2 19890807; JP S60204748 A 19851016; KR 850006923 A 19851025; KR 920000372 B1 19920113; US 4663490 A 19870505
DOCDB simple family (application)
EP 85102446 A 19850305; BR 8501167 A 19850315; CA 476480 A 19850314; DE 3409719 A 19840316; DE 3560827 T 19850305; ES 541319 A 19850315; JP 4844185 A 19850313; KR 850001669 A 19850315; US 71089585 A 19850312